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// Copyright 2015 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_
#define UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_
#include <base/macros.h>
#include <base/synchronization/lock.h>
#include <chromeos/secure_blob.h>
namespace chromeos_update_engine {
class BlobFileWriter {
public:
// Create the BlobFileWriter object that will manage the blobs stored to
// |blob_fd| in a thread safe way.
BlobFileWriter(int blob_fd, off_t* blob_file_size)
: blob_fd_(blob_fd),
blob_file_size_(blob_file_size) {}
// Store the passed |blob| in the blob file. Returns the offset at which it
// was stored, or -1 in case of failure.
off_t StoreBlob(const chromeos::Blob& blob);
// The number of |total_blobs| is the number of blobs that will be stored but
// is only used for logging purposes. If not set, logging will be skipped.
void SetTotalBlobs(size_t total_blobs);
private:
size_t total_blobs_{0};
size_t stored_blobs_{0};
// The file and its size are protected with the |blob_mutex_|.
int blob_fd_;
off_t* blob_file_size_;
base::Lock blob_mutex_;
DISALLOW_COPY_AND_ASSIGN(BlobFileWriter);
};
} // namespace chromeos_update_engine
#endif // UPDATE_ENGINE_PAYLOAD_GENERATOR_BLOB_FILE_WRITER_H_
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